I had researched buying a CNG car in the LA area and bringing it back to San Jose. Reliable miles per tank data was tough to come by, but it seemed like if you couldn't use PG&E stations to fill (because it requires pre-registration, and a certified inspection), you wouldn't be able to take the most direct route.
That was for a crown victoria/lincoln town car though. I don't know if the civic's get more miles per tank.
That was for a crown victoria/lincoln town car though. I don't know if the civic's get more miles per tank.